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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .R2K | BTM Innovation Pty | Database Files | Repertoire 2000 Music Database | Repertoire 2000 | BTM Innovation Pty |
| .RBF | Microsoft Corporation | Database Files | Windows Installer Rollback File | Windows Installer | Microsoft Corporation |
| .REX | Propellerhead | Database Files | ReCycle Loop File | Avid Pro Tools | Avid Technology |
| .RFG | Raddon Financial Group | Database Files | RFG Integrator System Database | Integrator | Fiserv, Inc. |
| .RFH | Raddon Financial Group | Database Files | RFG Integrator Householding Database | Integrator | Fiserv, Inc. |
| .RFL | Propellerhead | Database Files | Reason ReFill Sound Bank File | Reason | Propellerhead |
| .RIN | Protronics | Database Files | Retrieve 4GL Database Index | Retrieve 4GL | Protronics |
| .RMW | ALD | Database Files | RAM Commander Database File | RAM Commander | ALD |
| .ROD | RIB Software | Database Files | RIB Office Database File | RIB office | RIB Software |
| .RPC | Synthrone | Database Files | Rich Page Content Document | Synthrone Crafter | Synthrone |
| .RPD | RIB Software | Database Files | RIB Project Database File | iTWO | RIB Software |
| .RSD | Rosetta Stone | Database Files | Rosetta Stone Data File | Rosetta Stone Language Learning | Rosetta Stone |
| .RXD | Attachmate (Micro Focus) | Database Files | Attachmate Reflection X Manager Definition Data File | Attachmate Reflection | Attachmate (Micro Focus) |
| .RXH | Borland | Database Files | Reflex Database Help File | Borland Reflex | Borland |
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